When I look at old halftone prints from 60's and 70's, it looks to me as if they used contrast masking in reproductions from slides. This is specially visible on old saturated postcards, product brochurs etc.. The colors are very simplistic, and there are almost no highlights, plus there is that relief kind of a look, all of which are the effects of heavy contrast masking. I really get the same kind of results while experimenting in photoshop with masking If someone knows the usual practices of analog halftone printing from 70's, could you describe the steps to me (before making the actual plates)? Did it really include contrast/unsharp masking?